Biological Assessment – Gulf Side Reef

Transcription

BIOLOGICAL ASSESSMENT
NAVARRE BEACH PARK
GULF SNORKEL REEF SITE
SANTA ROSA COUNTY, FLORIDA
Prepared for:
Santa Rosa County
6495 Caroline St., Suite M
Milton, Fl 32570
Prepared by:
Wetland Sciences, Inc.
1829 Bainbridge Ave.
Pensacola, Florida 32501
August 7, 2009
TABLE OF CONTENTS
Page
1.0
INTRODUCTION .................................................................................... 1
2.0
PROJECT DESCRIPTION..................................................................... 1
3.0
PROJECT AREA ..................................................................................... 4
4.0
ALTERNATIVES CONSIDERED ......................................................... 4
4.1
4.2
5.0
No-Action Alternative ..................................................................... 5
Preferred Alternative ..................................................................... 5
STATUS OF LISTED SPECIES AND HABITAT ............................... 5
5.1
Loggerhead Sea Turtle .................................................................... 9
5.1.1 Status and Threats.................................................................. 9
5.1.2 Distribution and Range .......................................................... 10
5.1.3 Habitat ..................................................................................... 10
5.1.4 Presence in the Project Area ................................................. 11
5.2
Green Sea Turtle ............................................................................. 11
5.2.3 Habitat ..................................................................................... 12
5.3
Kemp’s Ridley Sea Turtle ............................................................... 13
5.3.3 Habitat ..................................................................................... 14
5.4
Leatherback Sea Turtle .................................................................. 14
5.4.3 Habitat ..................................................................................... 15
5.5
Hawksbill Sea Turtle ....................................................................... 16
5.5.3 Habitat ..................................................................................... 16
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5.6
Gulf Sturgeon ................................................................................... 17
5.6.3 Habitat ..................................................................................... 18
5.7 West Indian Manatee ...................................................................... 20
5.7.3 Habitat ..................................................................................... 21
6.0
STATUS OF NOT LISTED SPECIES AND HABITAT ...................... 22
6.1
Bottlenose Dolphin .......................................................................... 22
6.2
Alligator Gar .................................................................................... 23
7.0
CONCLUSIONS ....................................................................................... 23
8.0
REFERENCES ......................................................................................... 24
LIST OF ATTACHMENTS
ATTACHMENT A – Permit Drawings Depicting the Proposed Activity
ATTACHMENT B – Reef Materials
ATTACHMENT C – Vessel Strike Avoidance Measures and Injured or Dead Protected
Species Reporting
ATTACHMENT D – Sea Turtle and Smalltooth Sawfish Construction Conditions
ii
1.0
Introduction
This Biological Assessment (BA) has been prepared to fulfill the U.S. Army Corps of
Engineer’s (USACE) requirements as outlined under Section 7(c) of the Endangered
Species Act (ESA) of 1973, as amended. This BA evaluates the potential impacts that
the proposed Santa Rosa Sound Artificial Reef Deployment Sites may have on federally
listed endangered and threatened species, and describes the avoidance, minimization and
conservation measures proposed by the applicant, Santa Rosa County.
This BA is prepared pursuant to Section 7 of the Endangered Species Act (ESA) as well
as the relevant implementing regulations and agency guidance. 16 U.S.C. § 1536; 50
C.F.R. § 402.12; and Final ESA Section 7 Consultation Handbook (March 1998) [Section
7 Handbook]. The primary purpose of the BA is to address potential impacts to
threatened and endangered species and their designated critical habitats that may result
from the Project. The primary objectives of this BA are to:
2.0
•
Provide a conceptual framework of the history of the Project;
•
Document the evolution of the project alternatives and past consultations with the
United States Fish and Wildlife Services (USFWS), Corps, National Marine
Fisheries Service (MNFS) and the Florida Fish and Wildlife Commission (FWC);
•
Describe the Project, including the planned use and all proposed mitigation and
conservation measures;
•
Provide information on the natural history of federally-listed endangered or
threatened species, species proposed for listing and other sensitive species
potentially occurring in the vicinity of the Project;
•
Evaluate the potential effects of the Project on federally-listed or proposed-listed
endangered or threatened species; and
•
Provide a determination of effect (i.e., “no effect”, “may affect, not likely to
adversely affect, or modify critical habitat”, or “may affect, is likely to adversely
affect, or modify critical habitat”) for the listed and proposed-listed species.
Project Description
The proposed Navarre Beach Gulf Snorkel Reef site is approximately 275-ft. by 82-ft. in
dimension and is located approximately 340-ft. from the mean high water line of Navarre
Beach in depths ranging minus 10- to 11-feet mean low water (Attachment A).
It is the County’s intent to place Walter’s Eco-System Reef Modules (Attachment B) that
are 5-ft in diameter throughout the deployment site. The module will be placed 25-ft. on
center and a total of 30 modules will be placed in the deployment area. The top of the
module shall be a minimum of 6-feet from the mean low water elevation and at no time
shall not exceed ½ the distance between the bottom and the mean low water line
elevation. This reef site will increase near shore snorkeling opportunities along Navarre
Beach.
The Gulf Snorkel Reef at Navarre Beach Park is part of a three phase Marine Sanctuary
Plan. The goals for both the overall plan and for each component of the plan fall into
three categories – Environmental, Educational, and Economic. The Gulf Snorkel Reef is
1
an essential component providing a significant share of the environmental and
educational benefits for the entire plan.
• Environmental
o
o
Increased Marine Biodiversity
Provide Essential Marine Habitat for Juvenile Fish Species
Increased presence of marine organisms from their expected growth on the reef structures
will encourage increased biodiversity within the Gulf. The reef structures themselves,
coupled with the additional growth on the structures, will provide shelter that promotes
improved mortality rates for juvenile fish species.
• Educational
o
o
Amenity for Area Schools and Marine Science Center
Promote Grant Funded Studies
The Gulf Snorkel Reef site will provide an easily accessible amenity for Navarre High
School’s Marine Science Center located at the park and other educational institutions.
The reef’s amenity will be available for use in conducting public programs and activities
that promote general education about the area ecosystem and indigenous marine life. The
Washington High School Science Department chronological study of the reefs (detailed
in later sections), is one example of additions to the body of scientific knowledge that
will also provide learning opportunities and a baseline of knowledge about the reef.
•
Increased Economic Output
o
o
$351,000/Yr estimated Sound Side Reef contribution for Santa Rosa County.
$1.17 Million annually for the entire Marine Sanctuary Plan for Santa Rosa County
Two 2007 National Oceanic and Atmospheric Administration (NOAA) funded studies of
similar near shore natural reefs were used in our economic analysis to determine the
percentage breakouts of the different categories of economic value attributed to reef
systems on area economies.
The May 2007 University of West Florida (UWF) Haas Center Study on the economic
impact of the Oriskany was used to estimate the baseline value of the Diving and
Snorkeling impact to Santa Rosa County of the Oriskany by using a 75% factor of the
Escambia County estimate. An assumption of the analysis is that the Marine Sanctuary
reefs can increase the economic impact of the Oriskany by 8%. This is accomplished
through providing additional alternatives for visiting divers to visit other area reef
amenities and encouraging more visitors to bring family members or friends that may not
wish to dive the Oriskany, but would spend the day snorkeling or diving the near shore
reefs. Using the NOAA study derived economic output valuations and forecasting an 8%
increase in baseline diving related economic impact from the Oriskany provides the basis
for the increase in the overall economic output associated with the Sound Side and Gulf
Side Reefs in the Marine Sanctuary Plan. A graphic depicting the estimated increase in
economic output provided by the Marine Sanctuary is shown below.
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All populations within driving distance to Navarre Beach County Park will be served by
this project. The most benefit will go to those within a one hour drive of the park - this
population includes Escambia, Santa Rosa, and Okaloosa county residents. Improved
water quality, biodiversity and fisheries provide a societal benefit to all area residents and
visitors. The same population will enjoy the economic, recreational and educational
benefits provided by the reef, while a more widespread population are expected to enjoy
the educational and environmental benefits derived from scientific study of the reefs that
add to the body of general marine and environmental knowledge. There are two events Great American Cleanup and International Coastal Cleanup - that address general
waterway cleanup through collection of debris and trash along and in the waterway.
These events are participated in by various groups such as the Boy Scouts, High School
ROTC Units, and the Navarre Beach Area Chamber of Commerce.
The reef structures will provide essential marine habitat for juvenile fish species and
increase biodiversity. The combination of the additional surface area and the correct pH
provided by the natural Florida limestone of the Eco-System reefs will provide protective
homes for barnacles, oysters, and other organisms to attach themselves to the reefs. The
attached growth and the protective (from predation) nature of the reef’s disc design will
encourage other invertebrates that feed on the attached organisms to seek food and shelter
there. This will provide essential marine habitat for juvenile fish species affording them
better opportunities of growing to optimal breeding size. Over time the complexity of the
attached growth promotes biodiversity in the species using the reef as a food source and
shelter mechanism attracting a wider range of species.
Each month the Washington High School Science Department will gather information on
the health of the reef, which over time will chronicle the environmental impact the reef.
The reef will also offer area schools such as the University of West Florida (UWF),
Pensacola Junior College (PJC), and especially Navarre High School, opportunities to
perform similar studies on either the reef itself or the marine life supported by the reef.
Another service provided by the reef is recreational as visitors and residents to the park
will have easy access to snorkel and dive the reef by entry from the south side of the
Navarre Beach Park.
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The Gulf reef site will be long term assets for the community and as such will be
promoted for community benefit. Additionally a third phase of the Marine Sanctuary is
an observation pier extending to, and partially over the Gulf Side reef. Pending
successful creation of the reef system on both the Gulf and Sound sides of the park, the
Marine Sanctuary Committee will embark on permitting and fundraising for the
observation pier which will serve to enhance the reef environmentally through shading a
portion of the reef structures. It will provide increased, non intrusive use of the reef by
park visitors through observation.
3.0
Project Area
The proposed Navarre Beach Gulf Snorkel Reef site is approximately 275-ft. by 82-ft. in
dimension and is located approximately 340-ft. from the mean high water line of Navarre
Beach in depths ranging minus 10- to 11-feet mean high water.
Surveys completed by staff of Wetland Sciences, Inc. indicate the deployment site is
predominately unvegetated sand bottom with a surficial layer of
microalgae/cyanobacteria. Categories of affected Essential Fish Habitat within the
project area include marine water column and unvegetated sand bottom. There are no
seagrasses located within the vicinity of the deployment site. There are no natural rock
outcrops or hard bottom formations within the deployment sties.
4.0
Alternatives Considered
There were no alternatives considered.
Deployment Locations
The site was chosen to facilitate safe access and utilization. Factors considered included;
shore access and parking, ideal snorkel depths, avoidance of permitted borrow and/or
disposal sites, avoidance of safety fairways, anchorages, designated shipping lanes, and
avoidance of sensitive environmental resources (i.e. hard bottom formations, seagrasses,
etc.).
The site was located as close to shore as possible, within the depths specified, and in
adjacent to parking facilities maintained by Santa Rosa County.
Reef Material
A variety of reef materials have been successful used to construct artificial reefs. The
materials proposed within the deployment site is consistent with the material
specifications outlined in the DEP notice general permit 62-341.600, Florida
Administrative Code. The materials specified are consistent with the National Artificial
Reef Plan (As Amended): Guidelines for siting, construction, development, and
assessment of artificial reefs (U.S. Department of Commerce 2007).
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4.1
No-Action Alternative
The objective of the proposed activity is to increase near shore fishing, snorkeling, and
diving opportunities for residents of Santa Rosa County. Currently there are only a few
areas which offer such opportunities. To accept the No-Action Alternative would
abandon the following Artificial Reef Program Goals:
1. enhance the (primarily sand) seafloor of the marine and estuarine waters of, and
adjacent to, Santa Rosa County by the placement of stable and durable artificial
reef materials for the purpose of establishing access and creating habitat for reefassociated species of fishes and invertebrates.
2. increase regional abundance of marine life species
3. reduce negative impacts to natural reefs
4. provide fishing and diving opportunities for the residents and tourists of Santa
County
5. increase fishing and diving success, and artificial reef-user satisfaction
6. reduce conflicts between artificial reef users and user groups
7. enhance the local and state economies via goals 4 and 5
8. increase safety of boaters using artificial reefs via establishment of artificial reef
permits close to shore
9. increase fuel economy (decrease fuel consumption) via establishment of artificial
reef permits close to shore
10. establish snorkeling reefs in Gulf and inshore waters to provide access from
shore
The No-Action Alternative does not meet the stated objective for the proposed near-shore
reef deployment sites.
4.2
Preferred Alternative – Establishment of a Gulf Snorkel Reef Site
The preferred alternative is described in detail in the project description section of this
BA. The reef deployment location was selected based upon many factors, including:
proximity to safe harbor to minimize safety risks for boaters (particularly small vessels);
water depths shallower than 20 feet to provide artificial reefs for snorkeling; and
accessibility and adjacency to public upland parking facilities.
Reef Materials
It is the County’s intent to place Walter’s Eco-System Reef Modules that are 5-ft in
diameter throughout the deployment site. The modules will be placed 25-ft. on center
and a total of 30 modules will be placed in the deployment area. The top of the module
shall be a minimum of 6-feet from the mean low water elevation and at no time shall not
exceed ½ the distance between the bottom and the mean low water line elevation. This
reef site will increase near shore snorkeling opportunities along Navarre Beach.
Deployment Procedures
Pre-Deployment Notification: No less than 14 days prior to deployment of material
within the deployment site, the Permittee shall transmit by electronic mail (“e-mail”) a
complete and signed “Florida Artificial Reef Materials Cargo Manifest and PreDeployment Notification form to the Corps and FWC to allow inspection of the proposed
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reef materials as deemed necessary by the agencies. Inspections will be held at the
staging area. By signing the Pre-Deployment Notification the Permittee certifies that all
materials are free from asphalt, petroleum, other hydrocarbons and toxic residues. The
Permitte will take digital photos of representative components/piers of reef material and
transmit with the above form as PDF attachments to the appropriate agencies. Permittee
will ensure receipt of transmittals to appropriate agencies. The Permittee will not deploy
material if notified by the Corps or FWC that the material is questionable or unacceptable
until the material has been evaluated and released for deployment. Any material that is
deemed unacceptable for reef material will be disposed in an approved upland disposal
site.
Deployment of the material shall not occur until the end of the 14 day inspection period.
The Permittee will ensure both a copy of the Corps and DEP permit and the signed
“Florida Artificial Reef Materials Cargo Manifest and Pre-Deployment Notification
form” are maintained aboard the deployment vessel at all times during loading, transit,
and deployment.
Deployment Monitoring:
The Permittee or the permittee’s representative shall be on site during every deployment
to verify compliance with the permit and its conditions. The authorized representative
shall not be the person who physically or contractually is responsible for deployment of
the transported reef materials. The permittee or representative will verify geographic
coordinates using a Differentially Corrected Global Positioning System (DGPS) accurate
to within 5 meters horizontal distance. Depth shall be verified utilizing fathometer, depth
sounder, or similar device accurate to within 1 meter.
Post Deployment Monitoring:
Within 12 months from the effective date of this permit and annually thereafter until
expiration of the deployment authorization, the Permittee shall submit to the Corps and
FWC a spreadsheet listing the deployments that occurred within the previous 12 months
and a written report which summarizes, analyses, and draws conclusions regarding the
activities or issues associated with the reef in the past twelve months. For each
deployment, the spreadsheet will include the local tracking number, date deployed,
geographic coordinates, description and quantity of the material deployed, depth of water
above material, approximate area of seafloor covered. The spreadsheet will document
any known changes in material condition (stability, durability, and location) as compared
to those same characteristics at time of deployment. The report may include but is not
limited to use trends, site management constraints and resolutions, management
techniques, modifications of operations plans, lessons learned, etc. Results of any
performance monitoring (description of fish and other biota observed) will be included in
the report. The report shall be limited to 5 pages of written text and include a permit
drawing(s) or similar visual depiction of the location of each deployment in relation to
the boundary of the reef site. Immediately upon expiration of the deployment
authorization or request for permit extension, a summary of reports submitted since the
last permit issuance/renewal will be submitted to the Corps, NOAA, and FWC. This
compilation will document any known changes in material stability, durability, or
location as compared to that most recently reported for a site as well as a
summary/analysis of the qualitative data (trends, lessons learned, etc.) in the yearly
reports.
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Monitoring
Santa Rosa County will conduct yearly underwater monitoring of the deployed artificial
reefs using methods described in County’s formally adopted Artificial Reef Plan. This
plan presented below is taken directly from the County’s Plan.
Artificial reef monitoring is considered an important component of artificial reef
management (National Artificial Reef Plan., Stone, 1985). Indeed, true “management” of
a public artificial reef program must include post-construction monitoring. However,
monitoring has been interpreted in different ways by different individuals, managers, and
agencies. For the purposes of this Plan, artificial reef monitoring will consist of four
“Levels”. The specific Monitoring Level(s) utilized will be determined by the relevant
factors, including: available resources (funding and personnel); relative need for
particular or specific information; relative quantity (or potential) of material in question.
It is desirable to perform artificial reef monitoring to the fullest possible extent. However,
fiscal and/or operational constraints may restrict monitoring to the level(s) deemed
necessary or important. To the greatest extent possible, Santa Rosa County will monitor
and assess the effectiveness of public artificial reefs.
Level 1: Geographic Monitoring Exact coordinates (latitude/longitude and LORAN) of
each public artificial reef and permit area boundary will be determined using separate
Differential Geographic Positioning System (DGPS) and LORAN receivers.
Latitude/longitude coordinates should be recorded in degrees and decimal minutes (e.g.,
30° 12.345’N; 87° 12.345’W). To determine with certainty the position of public
artificial reefs, after the materials have been located using fathometer, visual certification
(via SCUBA or other visual remote equipment) will be accomplished. Plotting of public
artificial reefs will be performed utilizing latitude/longitude coordinates from DGPS
equipment. These data are important to certify to permitting agencies that materials are
at the designated location(s) and to verify permit compliance. The quality of this data is
of the utmost importance to artificial reef users. The information is also important for
comparison after storms or other events to determine if the artificial reef has been moved.
Level 2: Artificial Reef Physical Attribute Monitoring Physical characteristics (e.g.,
length, width, height, materials type(s), and configuration) of public artificial reefs are
measured and recorded using waterproof writing materials and/or underwater
photography/videography. Other important data include: habitat complexity, condition
and orientation of materials, and percent of materials that have subsided below the
seafloor. These data are important to determine the stability and durability of the artificial
reef materials under consideration. Underwater configuration may also provide
information regarding effectiveness of deployment methods. Amount of reef that has
subsided into the seafloor may yield information regarding sediment suitability and
hydrodynamic forces at that location.
Level 3: Reef utilization and user satisfaction. Reef utilization and user satisfaction
information may be obtained in several ways, each with its advantages and
disadvantages. On-site surveys are conducted on the water while the public artificial reef
user is located at an artificial reef. Advantages of this approach include: ease of
determination of the number of vessels at a particular (and nearby) artificial reef; fish
catch information at the specific reef may be obtained; answers to survey questions are
more likely to reflect user’s satisfaction while at the reef; and ability to sample users at a
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predetermined number/variety of artificial reefs. Disadvantages include high cost of
survey due to the need for surveyor to use a boat, vessel-to-vessel communication
difficulty, and reef user may become irritated at the interruption of fishing/diving
activities. An alternate approach, ramp-intercept survey, is less expensive and easier to
communicate; however, the accuracy of the responses may be lower than that of on-water
surveys. Catch information may not allow determination of specific catch at specific
reef(s); this information, combined with Level 4 data, may help explain some of the
variation in Level 4 data. Other sampling methods for artificial reef user data include
“customer satisfaction” surveys conducted by Santa Rosa County. These surveys may be
conducted by various methods including: direct mail, telephone, and internet. Reef
utilization and user satisfaction information are important to artificial reef managers for
short and long term planning. Reef preferences and overcrowding may guide decisions
for reef materials and/or placement. Level 3 data are important for the evaluation of
Program Goals (#’s: 3, 5, and 6). On-water surveys have a “public relations” benefit, and
artificial reef managers may make more confident decisions with knowledge gained in
the field.
Level 4: Biological Monitoring Biological monitoring protocols vary widely among
artificial reef managers and researchers, probably because of differences in water
conditions, habitat/community types, and questions/hypotheses. A survey of the scientific
literature is an important step in determination of methodology for a particular biological
monitoring study. Whenever possible, biological information will be recorded. ECDMR
usually records the presence of commercially/recreationally important fishes observed
during Level 2 monitoring dives. Although SCUBA divers most often obtain Level 4 data
using underwater video or pencil and waterproof paper, remote sensing technology may
soon provide reliable methods that are not limited by divers’ “bottom time”. Although
arguably the most difficult and expensive to obtain, Level 4 data have the potential to be
the most valuable in artificial reef Program management. As previously mentioned, Level
3 (catch) data may explain some of the variation in Level 4 data.
5.0
Status of Listed Species and Habitat
While numerous state and federally listed species potentially occur in Santa Rosa County,
Florida, table 1 provides a listed species that may be potentially affected by the proposed
project.
Listed Species
Marine Mammals
West Indian manatee
Sea Turtles
Green sea turtle
Kemp's ridley sea
turtle
Leatherback sea
turtle
Hawksbill sea turtle
Loggerhead sea turtle
Fish
Gulf sturgeon
Scientific Name
Status
Trichechus manatus
Endangered
Chelonia mydas
Endangered
Lepidochelys kempii
Endangered
Dermochelys coriacea
Endangered
Eretmochelys imbricata
Caretta caretta
Endangered
Threatened
Acipenser oxyrinchus
desotoi
Threatened
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Five, federally-protected, endangered whales species are of potential occurrence in the
Gulf of Mexico: blue whale (Balaenoptera musculus), finback whale (Balaenoptera
physalus), humpback whale (Megaptera novaeangliae), sei whale (Balaenoptera
borealis), and sperm whale (Physeter macrocephalus). These five whale species are not
considered in this BA as these whales are generally restricted to offshore waters, and
therefore unlikely to be found in or near the project area.
One federally-protected, endangered ray is of potential occurrence in the Gulf of Mexico:
smalltooth sawfish (Pristis pectinata). Smalltooth sawfish were once prevalent
throughout Florida and were commonly encountered from Texas to North Carolina.
Currently, smalltooth sawfish can be only found with any regularity in south Florida
between the Caloosahatcheee River and the Florida Keys (NMFS 2006), and therefore is
unlikely to be found in or near the project area and is not considered in this BA.
5.1
Loggerhead Sea Turtle
5.1.1
Status and Threats
The loggerhead turtle (Caretta caretta) was listed as threatened throughout its range on
July 28, 1978 (43 FR 32808). The loggerhead is the most abundant sea turtle species in
U.S. coastal waters (NMFS and USFWS 1991a).
Genetic research has identified four different loggerhead nesting subpopulations in the
southeastern United States: (1) the Northern Subpopulation ranging from North Carolina
to Northeast Florida; (2) South Florida Subpopulation ranging from just north of Cape
Canaveral, Florida and extending to Sarasota, Florida; (3) Dry Tortugas, Florida
Subpopulation; and (4) Northwest Florida Subpopulation on the beaches of Florida’s
Panhandle (Bowen et al. 1993, Bowen et al. 1994, Bowen 1995, Encalada et al. 1998,
Pearce 2001). Each nesting subpopulation is considered a distinct reproductive
population. Due to the high site fidelity of nesting females to their natal region and low
gene flow among nesting assemblages, most western North Atlantic loggerhead nesting
assemblages are vulnerable to extirpation.
Based upon nesting data collected on index nesting beaches in the U.S. from 1989-1998,
the total number of loggerhead nests laid along the Atlantic and Gulf Coasts ranged from
53,016 nests to 89,034 nests annually. On average 0.8% of the nests were from the
Florida Panhandle subpopulation.
The most significant threats to the loggerhead sea turtle population are coastal
development, commercial fisheries and marine pollution (NMFS 2007a). Juvenile
loggerhead turtles are particularly susceptible to impacts associated with shrimp fisheries
offshore of the Atlantic coast and along the southeastern Atlantic coast. Shrimp
harvesting is managed in the Gulf of Mexico: waters out to 200 nautical miles are closed
annually for 3 months to shrimp fishing offshore of Texas (mid May through mid July) to
allow shrimp to migrate out of estuarine waters. The management of shrimp harvesting
in the Gulf appears to contribute to the reduction of sea turtle stranding during this period
(NMFS unpublished data).
Loggerhead nesting habitat is threatened with beach erosion, armoring and nourishment;
artificial lighting; increased human activity associated with coastal development,
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including poaching activities; natural predation by fire ants, raccoons, armadillos, and
opossums; and storm activity. Negative impacts to sea turtle nesting and hatching
success in Santa Rosa County include predation, hatchling disorientation due to artificial
upland lighting, human activity/disturbance, and lost or damaged nests due to storm
activity.
5.1.2
Distribution and Range
Loggerhead sea turtles occur throughout the temperate and tropical regions of the
Atlantic, Gulf of Mexico, Pacific and Indian Oceans. The loggerhead occurs in open
water as far as 500 miles from shore, but is mainly found over the continental shelf and in
bays, estuaries, lagoons, creeks, and mouths of rivers. The loggerhead favors warm
temperate and subtropical regions in relatively close proximity to shorelines. Similar to
other sea turtles species, water temperature influences the movements of loggerhead, and
they do not usually appear at summer foraging grounds until June, although some
individuals can be found in Virginia as early as April. Immature stages of loggerheads
(juveniles/sub-adults) which forage in the northeastern U.S. are known to migrate
southward in the fall as water temperatures drop, and migrate northward in spring.
5.1.3
Habitat
Loggerheads are primarily carnivorous, feeding on sponges, squid, sea urchins, crabs,
horseshoe crabs, shrimp, basket starfish and a variety of mollusks. Loggerhead turtles are
primarily bottom feeders; however they also feed on jellyfish while swimming in the
water column or resting/basking near the surface of the water. Under certain conditions,
they may prey upon slow moving, demersal fish species. Hatchlings and juveniles feed
on prey concentrated at the surface such as gastropods and Sargassum. Along the Gulf
Coast, loggerhead sea turtles are frequently observed near offshore oil platforms, natural
hardbottom/reefs and rock jetties.
Adult loggerheads occupy various habitats from turbid bays to clear waters of reef. After
emergence from the nest, hatchlings move out to sea, and spend approximately 3 to 5
years in the pelagic immature stage, generally associated with floating Sargassum mats
(NMFS and USFWS 1991a). The pelagic stage may span as long as 7 to 12 years.
Juveniles/sub-adults occur mainly in nearshore and estuarine waters and use these
habitats for feeding. As loggerheads mature, they travel and forage through nearshore
waters until their breeding season, when they return to the nesting beach. The estimated
age at maturity is approximately 21 to 35 years (Frazer and Ehrhart 1985; Frazer et al.
1994). The majority of mature loggerheads appear to nest on a two or three year cycle.
Major nesting beaches for loggerheads include the Sultanate of Oman, southeastern
United States and eastern Australia. In the continental U.S., loggerhead sea turtles nest
along the Atlantic coast from Florida to New Jersey (Musick 1979). In the western
Atlantic, most loggerhead nesting occurs from North Carolina to Florida and the Gulf
Coast. The southeastern nesting population is critical to the survival of the species and is
second in size only to the nesting aggregation on Masirah Island, Oman. Steeply sloped
beaches with gradually slopes offshore approaches are generally favored by nesting
females. Approximately 80% of all loggerhead nesting in the southeastern U.S. occurs in
six Florida counties (Brevard, Indian River, St. Lucie, Martin, Palm Beach, and Broward
Counties)
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5.1.4
Presence in the Project Area
Sea turtle nesting data for Santa Rosa County is available from the Florida Fish and
Wildlife Conservation Commission (FFWCC). Sea turtle nesting season in Santa Rosa
County extends from May 1st through October 31st. The loggerhead is responsible for the
majority of nesting in Santa Rosa County.
Within the vicinity of the project area, no loggerhead sea turtles or nests have been
observed. Since the loggerhead sea turtle may occur in the project area, the applicant will
comply with the “Vessel Strike Avoidance Measures and Injured or Dead Protected
Species Reporting” guidance for marine turtles and marine mammals and National
Marine Fisheries Service’s “Sea Turtle and Smalltooth Sawfish Construction
Conditions”, provided in Attachment C and D.
The project is not anticipated to affect loggerhead sea turtle foraging areas or critical
habitat therefore the deployment of artificial reefs within the project area will not likely
have an adverse affect on the loggerhead sea turtle.
5.2
Green Sea Turtle
5.2.1
Status and Threats
The green sea turtle (Chelonia mydas) was listing on July 28, 1978 as threatened, except
for Florida and the Pacific Coast of Mexico(including the Gulf of California), where it
was listed as endangered (43FR 32808). The greatest cause of the worldwide decline in
green turtle populations is the commercial harvest for eggs and meat. In Florida, the
nesting population was nearly extirpated within 100 years of the initiation of commercial
exploitation.
Green sea turtle population in Florida, Hawaii and other parts of the world have
experienced significant mortality from the disease, fibropapillomatosis, which is a disease
characterized by the development of multiple tumors on the skin and internal organs.
The tumors can interfere with swimming, eating, breathing, vision and reproduction.
Other threats to green sea turtles include loss or degradation of nesting habitat from
coastal development and beach armoring; disorientation of hatchlings by beachfront
lighting; excessive nest predation by fire ants, raccoons and opossums; degradation of
foraging habitat; marine pollution and debris; watercraft strike; and incidental take from
commercial fishing operations such as shrimp trawling.
Due to their main dietary component of seagrass, Caribbean green sea turtles are
considered to be nutrient limited, resulting in low growth rates, delayed sexual maturity,
and low annual reproductive effort. This low reproductive effort makes recovery of the
species slow once the adult population number have been severely reduced (Bjorndal
1981). Estimates of age at sexually maturity range from 20 to 50 years (Balazs 1982;
Frazer and Ehrhart 1985) and the lifespan may be over 100 years.
5.2.2
The green sea turtle is a circumglobal species in tropical and subtropical waters. In the
U.S. Atlantic waters, it occurs around the U.S. Virgin Islands, Puerto Rico, and the
continental U.S. from Massachusetts to Texas. Relatively small numbers nest in Florida
11
with even smaller numbers in Georgia, North Carolina and Texas (NMFS and USFWS
1991b; Hirth 1997). Green turtles are distributed more widely in the summer when
warmer temperatures allow them to migrate north along the Atlantic Coast. Juvenile and
sub-adult green sea turtles can be found in estuarine and coastal waters from Long Island
Sound, Chesapeake Bay and North Carolina sounds south throughout the tropics (Musick
and Limpus 1997). As the water temperatures decline during the winter months, green
sea turtles that are found north of Florida migrate south into subtropical and tropical
water.
Major nesting areas for green sea turtles in the Atlantic include Surinam, Guyana, French
Guyana, Costa Rica, the Leeward Islands and Ascension Island in the mid Atlantic.
Historically in the U.S., green turtles have been known to nest in the Florida Keys and
Dry Tortugas. Green sea turtles primarily nest on selected beaches along the coast of
eastern Florida, predominantly Brevard through Broward Counties. In the southeastern
U.S., the majority of nesting occurs during the months of June, July and August.
5.2.3
Habitat
The green turtle primarily utilizes shallow habitats such as lagoons, bays, inlets, shoals,
estuaries and other areas with abundance for marine algae and seagrasses. Individuals
observed in the open ocean are believed to be migrating to feeding grounds or nesting
beaches (Meylan 1982). Hatchlings often float in masses of algae (Sargassum sp) in
convergence zones. Coral reefs and rock outcrops are often used as resting areas.
Green sea turtle hatchlings are believed to feed mainly on jellyfish and other
invertebrates. Adult green sea turtles prefer an herbivorous diet frequenting shallow
water flats for feeding (Fritts et al. 1983). Adult turtles feed primarily in seagrasses such
as Thalassia testudinum. This vegetation provides the turtles with a high fiber content
and low forage quality (Bjorndal 1981). Green turtles migrate long distances between
feeding and nesting areas (Carr and Hirth 1962). Nocturnal resting sites may be a
considerable distance from feeding areas and distribution of the species is generally
correlated with grassbed distribution, location of resting beaches and possibly ocean
currents (Hirth 1971). In the Gulf of Mexico, principal foraging areas are located in the
upper west coast of Florida. Green sea turtle hatchlings are believed to feed mainly in
jellyfish and other invertebrates.
Nesting occurs nocturnally at 2, 3 or 4 year intervals and females only occasionally
produce clutches in successive year. Little is known about the pelagic distribution of
hatchlings to juvenile size. When juveniles reach a carapace length of approximately 20
to 25 cm, they leave their pelagic habitats and enter benthic foraging areas, shifting to an
herbivorous diet.
5.2.4
County extends from May 1st through October 31st.
Within the vicinity of the project area, no green sea turtles or nests have been observed.
Since the green sea turtle may occur in the project area, the applicant will comply with
the “Vessel Strike Avoidance Measures and Injured or Dead Protected Species
12
Reporting” guidance for marine turtles and marine mammals and National Marine
Fisheries Service’s “Sea Turtle and Smalltooth Sawfish Construction Conditions”,
provided in Attachment C and D.
The project is not anticipated to affect green sea turtle foraging areas or critical habitat,
therefore, with use of the demolition conditions the project will not likely have an
adverse affect on the green sea turtle.
5.3
Kemp’s Ridley Sea Turtle
5.3.1
Status and Threats
Kemp’s ridley sea turtle (Lepidochelys kempii) was listed as endangered throughout its
range on December 2, 1970 (35 FR 18320). Of the seven extant species of sea turtles, the
Kemp’s ridley has declined to the lowest population level. Recent studies suggest
increased nesting activities and an overall increase in population size due to increased
hatchling production and survival rates of immature turtles (USFWS 2000). Kemp’s
ridleys have been subject to high levels of incidental take by shrimp trawlers (USFWS
and NMFS 1992). In 1990, the National Research Council’s Committee on Sea Turtle
Conservation estimated that 86% of human caused death of juvenile and adult loggerhead
and Kemp’s ridley resulted from shrimp trawling (Campbell 1995). The recent increased
survival of juvenile and sub-adult individuals is partly attributed to the use of turtle
exclusion devices (TEDs) in commercial shrimping fleets.
The primary decline of Kemp’s ridley is due to human activities including collection of
eggs, fishing for juveniles and adults and direct take for indigenous use. Dredging
operations affect Kemp’s ridley turtles through incidental take and degradation of habitat.
Incidental take of Kemp’s ridley has been documented with hopper dredging. Similar to
other sea turtles species, future threats to the Kemps’ ridley include interaction with
fishery gear; marine pollution which results in the ingestion of manmade debris and
garbage; destruction of foraging habitat; illegal poaching; and impacts to nesting beaches
associated with rising sea level, development, artificial lighting and tourism pressure.
5.3.2
Adults are primarily restricted to the Gulf of Mexico, although juveniles may range
throughout the Atlantic Ocean since they have been observed as far north as Nova Scotia
(Musick 1979). Important foraging areas include Campeche Bay, Mexico and Louisiana
coastal waters. Nearly the entire population of Kemp’s ridleys nest on an 11 mile stretch
of coastline near Ranch Nuevo, Tamaulipas, Mexico, approximately 190 miles south of
the Rio Grande. A second nesting aggregation occurs at Tuxpan, Veracruz.
Juveniles and sub-adults have been found along the eastern seaboard of the U.S. and in
the Gulf of Mexico. Studies suggest that the benthic stage, juvenile turtles stay in
shallow, warm nearshore waters in the northern Gulf until cooling waters force them
offshore or south along the Florida coast (Renaud 1995). Little is known about the
movements of the post hatchling, pelagic stage within the Gulf. Studies have indicated
that this stage varies from 1 to 4 or more years and the immature stage lasts about 7 to 9
years. The maturity age of this species is estimated to 7 to 15 years. Females return to
their nesting beach approximately every other year with nesting from April into July and
13
usually limited to the western Gulf of Mexico. The mean clutch size for this species is
about 100 eggs per nest and an average of 2.5 nests per female per season.
5.3.3
Habitat
Kemp’s ridleys inhabit shallow coastal and estuarine waters, usually over sand of mud
bottoms. Adults are primarily shallow water benthic feeders that specialize on crabs,
especially portunid crabs, while juveniles feed on Sargassum sp. and associated infauna
and other epipelagic species of the Gulf (USFWS and MNFS 1992). Other food items
include shrimp, snails, bivalves, sea urchin, jellyfish, sea stars, fish and occasionally
marine plants (Pritchard and Marquez 1973; Shaver 1991; Campbell 1995).
5.3.4
Within the vicinity of the project area, no Kemp’s ridley sea turtles or nests have been
observed. Since the Kemp’s ridley sea turtle may occur in the project area, the applicant
will comply with the “Vessel Strike Avoidance Measures and Injured or Dead Protected
The project is not anticipated to affect Kemp’s ridley sea turtle foraging areas or critical
habitat therefore with use of the demolition conditions the project will not likely have an
adverse affect on the Kemp’s ridley sea turtle.
5.4
Leatherback Sea Turtle
5.4.1
Status and Threats
The leatherback sea turtle (Dermochelys coriacea) was listed as endangered throughout
its range on June 2, 1970 (35 FR 8495), with critical habitat designated in the U.S. Virgin
Islands on September 26, 1978 and March 23, 1979 (43 FR 43688-43689 and 44 FR
17710-17712, respectively).
The general decline of the leatherback sea turtle is attributed to exploitation of eggs (Ross
1981). The population has been threatened by egg harvesting in countries such as
Malaysia, Surinam, the Guiana’s, the west coast of Mexico, Costa Rica and in several
Caribbean Islands. In the past, leatherbacks were killed for their abundant oil, which was
used for oil lamps and for caulking wooden boats. Similar to other sea turtle species,
ingestion of manmade debris, such as plastic bags and other plastic waste, is a significant
cause of mortality in leatherback turtles.
Leatherbacks prefer open access beaches possibly to avoid damage to their soft plastron
and flippers. Unfortunately, open beaches with little shoreline protection are vulnerable
to beach erosion triggered by seasonal changes in wind and wave direction. Nests are
more susceptible to inundation on open beaches during severe erosion events.
14
5.4.2
The leatherback, the largest of all sea turtles, is mainly pelagic, inhabiting the open ocean
and diving nearly continuously to great depths. Leatherbacks seldom approach land
except for nesting (Eckert 1992). The leatherback is probably the most wide ranging of
all sea turtle species, occurring in the Atlantic, Pacific and Indian oceans; as far north as
British Columbia, Newfoundland, Great Britain and Norway; as far south as Australia,
Cape of Good Hope, and Argentina; and in other water bodies such as the Mediterranean
Sea (NFWL 1980). Distribution of this species has been linked to thermal preference and
seasonal fluctuations in the Gulf Stream and other warm water features (Fritts et al.
1983).
5.4.3
Habitat
Leatherback sea turtles are omnivorous. Leatherbacks feed mainly on pelagic soft bodied
invertebrates such as jellyfish and tunicates. Their diet may include squid, fish,
crustaceans, algae and floating seaweed. Highest concentrations of these prey animals
are often found in upwelling areas or where ocean currents converge. They will also
ingest plastic bags and other plastic debris, which are commonly generated by oil drilling
rigs and production platforms in coastal Florida, Alabama, Mississippi and Louisiana
(Fritts et al. 1983).
Leatherbacks nest primarily in tropical regions. Major nesting beaches include Malaysia,
Mexico, French Guiana, Surinam, Costa Rica and Trinidad (Ross 1981). Leatherbacks
nest only sporadically in some of the Atlantic and Gulf states of the continental U.S., with
one nesting reported as far north as North Carolina (Schwartz 1976). In the Atlantic and
Caribbean, the largest nesting assemblages occur in the U.S. Virgin Islands, Puerto Rico
and Florida (NMFS 2007a). During the summer, leatherbacks tend to occur along the
east coast of the U.S. from the Gulf of Maine to the middle of Florida.
5.4.4
Within the vicinity of the project area, no leatherback sea turtles or nests have been
observed. Since the leatherback sea turtle may occur in the project area, the applicant
The project is not anticipated to affect leatherback sea turtle foraging areas or critical
habitat therefore with use of the demolition conditions the project will not likely have an
adverse affect on the leatherback sea turtle.
15
5.5
Hawksbill Sea Turtle
5.5.1
Status and Threats
The hawksbill sea turtle (Eretmochelys imbricata) was federally listed as endangered on
June 2, 1970 (35 FR 8495) with critical habitat designated in Puerto Rico on May 24,
1978 (43 FR 22224). In 1998, NMFS designated critical habitat near Isla Monito, Puerto
Rico, seaward to 5.6 km (63 FR 46693-46701).
The greatest threat to this species is from the harvest of the hawksbill shell for jewelry.
Between 1970 and 1989, Japanese imports of hawksbill shell totaled 713, 850 kg,
representing more than 670,000 turtles. The hawksbill is also used in the manufacture of
leather, oil, perfume and cosmetics (NMFS 2007a).
Other threats to the hawksbill sea turtles include destruction of nesting locations by beach
development, incidental take in fishery operations, pollution by petroleum products,
entanglement in marine debris (Meylan 1992), and predation on eggs and hatchlings. In
America Samoa, villagers harvest sea turtle eggs when encountered (Tuato-o-Bartley et
al. 1993).
5.5.2
The hawksbill is circum tropical, occurring in tropical and subtropical seas of the
Atlantic, Pacific and Indian Oceans (Witzell 1983). This species is probably the most
tropical of all marine turtles, although it does occur in many temperate regions. The
hawksbill sea turtle is widely distributed in the Caribbean Sea and western Atlantic
Ocean, with representatives of at least some life history stages regularly occurring in
southern Florida and the northern Gulf (especially Texas), south to brazil (NMFS 2007a).
In the continental U.S., the hawksbill largely nests in Florida where it is sporadic at best
(NFWL 1980). However, a major nesting beach exists on Mona Island, Puerto Rico.
Elsewhere in the western Atlantic, hawksbills nest in small numbers along the Gulf Coast
of Mexico, the West Indies and the Caribbean coasts of Central and South America
(Musick 1979).
5.5.3
Habitat
Hawksbills generally inhabit coastal reefs, bays, rocky area, passes, estuaries and
lagoons, in water depths of less than 70 feet. Similar to green sea turtles, hatchlings are
sometimes found floating in masses of pelagic marine algae (Spargassum sp.) (NFWL
1980). When they reach a carapace length of approximately 20 to 25 centimeters,
hawksbill juveniles reenter coastal waters. Coral reefs are widely recognized as the
resident foraging habitat of juveniles, sub-adults and adults. This habitat associates is
likely related to their diet of sponges, which need solid substrate for attachment.
Hawksbills are omnivorous and prefer invertebrates, especially encrusting organisms, and
will feed on plant material such as algae, seagrasses and mangroves (Carr 1952; Rebel
1974; Pritchard 1977; Musick 1979; Mortimer 1982). Hawksbills also occur around
rocky outcrops and high energy shoals, which are also optimum sites for sponge growth.
16
5.5.4
No documented records of hawksbills exist from Santa Rosa County, Florida; however.
This species is of potential occurrence within the offshore areas of the northwest Gulf of
Mexico. Within the vicinity of the project area, no hawksbill sea turtles or nests have
been observed. Since the hawksbill sea turtle may occur in the project area the applicant
Species Reporting” guidance for marine turtles and marine mammals and “Sea Turtle and
Smalltooth Sawfish Construction Conditions”, provided in Attachment C and D.
The project is not anticipated to affect hawksbill sea turtle foraging areas or critical
habitat therefore the deployment of artificial reefs within the project area will not likely
have an adverse affect on the hawksbill sea turtle.
5.6
Gulf Sturgeon
5.6.1
Status and Threats
The USFWS and NMFS listed the Gulf Sturgeon (Acipenser oxyrhinchus desotoi) a
subspecies of the Atlantic sturgeon (A. oxyrhinchus), as endangered on September 30,
1991 (56 FR 49653 49658). As with other sturgeon species, the damming of rivers has
been the most significant threat to the Gulf sturgeon (NMFS 2007b). Other threats to the
species include over exploitation, incidental catch, dredging activities, the removal of
snags and dredged material placement associated with channel improvements and
maintenance (USFWS and Gulf States Marine Fisheries Commission [GSMFC] 1995;
NMFS 2007b).
5.6.2
The gulf surgeon is anadromous, which means the species breeds in freshwater
environments, but spends the remainder of the year in marine and estuarine
environments. Spawning occurs in the deeper portions of rivers on clean rock or rubble
bottoms. Mud and sand bottoms and seagrass communities are likely important marine
habitats (USFWS and GSMFC 1995). The Gulf sturgeon lives in riverine systems during
the warmer months of the year and during the remaining months (November through
March), the Gulf sturgeon migrates to estuarine or Gulf of Mexico waters to feed. In
early to late spring, the fish migrate to the riverine systems to spawn.
The Gulf Sturgeon historically ranged along the northeastern Gulf, in major rivers from
the Mississippi delta in Louisiana, east to Charlotte Harbor, Florida, and in marine waters
of the central and eastern Gulf (USFWS and GSMFC 1995; NMFS 2007b). Its current
range extends from Lake Pontchatrain and the Pearl River in Louisiana and Mississippi
east to the Suwannee River in Florida. There are sporadic reports from as far west as the
Rio Grande River between Texas and Mexico, and as far east and south as Florida Bay.
Viable populations exist in the Mississippi, Pearl, Escambia, Yellow, Choctawhatchee,
Apalachicola, and Suwannee rivers (NMFS 2007b).
17
5.6.3
Habitat
The movement and behavior of the Gulf sturgeon is discussed in the Gulf Sturgeon
Recovery/Management Plan produced by the USWS, GSMFC and NMFS (1995).
Unpublished information from NMFS and USFWS personnel and other suggest that,
while in the Gulf of Mexico during the winter months, the Gulf sturgeon may spend a
portion of time feeding in relatively shallow water in the nearshore (<30ft.). However,
there are some anecdotal reports of Gulf sturgeon as much as twelve mile offshore (Olsen
Associates, Inc 2002). The primary migratory pathway of Gulf sturgeon is parallel to the
shoreline in the nearshore area.
A priority action item identified in the Gulf Sturgeon Recovery/Management Plan was
the identification of Gulf sturgeon estuarine and marine habitat use. During the Gulf
Sturgeon Marine Movement and Habitat Use Study, researchers collected and analyzed
data through the capture, tagging, release and subsequent recapture of these species. Data
collected from several years of research suggest that the fish near Panama City Beach are
usually found to the east of the St. Andrews Bay inlet along Tyndall and Mexico
Beaches, which are known over wintering areas (Frank Parauka 2006, personal
communication for the Panama City Shore Protection Project Biological Assessment,
April 13, 2006). Gulf sturgeons from the Brothers, Yellow, Apalachicola and
Choctawhatchee Rivers have been located off Tyndall and/or Mexico Beaches in water
depths typically of 12-20 feet (Frank Parauka 2006, personal communication for the
Panama City Shore Protection Project Biological Assessment, April 13, 2006). Studies
supporting the critical habitat rule indicated that the Gulf sturgeon’s diet includes
amphipods, lancelets, polychaetes, gastropods, shrimp, isopods, mollusks and
crustaceans.
5.6.4
Presence in Project Area
The reef site is located within Unit 11 critical habitat area for the Gulf Sturgeon (Figure
1.). Unit 11 includes a portion of the Gulf of Mexico as defined by the following
boundaries. The western boundary is the line of longitude 87/20.0'W (approximately 1
nm (1.9 km) west of Pensacola Pass) from its intersection with the shore to its
intersection with the southern boundary. The northern boundary is the MHW of the
mainland shoreline and the 72 COLREGS lines at passes as defined at 30 CFR 80.810 (ag). The southern boundary is 1 nm (1.9 km) offshore of the northern boundary. The
eastern boundary is the line of longitude 85/17.0'W from its intersection with the shore
(near Money Bayou between Cape San Blas and Indian Peninsula) to its intersection with
the southern boundary.
18
Figure 1. Gulf Sturgeon Critical Habitat Unit #11.
Since Gulf sturgeon may occur in the project area, a discussion of the project relative to
the seven elements considered essential for the conservation of the species follow:
(1) Abundant food items, such as detritus, aquatic insects, worms, and/or mollusks,
within riverine habitats for larval and juvenile life stages; and abundant prey items, such
as amphipods, lancelets, polychaetes, gastropods, ghost shrimp, isopods, mollusks and/or
crustaceans, within estuarine and marine habitats and substrates for subadult and adult
life stages.
The project site is not located within a riverine area and will not alter or negatively affect
foraging opportunities.
(2) Riverine spawning sites with substrates suitable for egg deposition and development,
such as limestone outcrops and cut limestone banks, bedrock, large gravel or cobble beds,
marl, soapstone, or hard clay;
The project site is not located within spawning areas, and thus will not affect spawning
behavior or suitable substrates.
(3) Riverine aggregation areas, also referred to as resting, holding, and staging areas,
used by adult, subadult, and/or juveniles, generally, but not always, located in holes
below normal riverbed depths, believed necessary for minimizing energy expenditures
during fresh water residency and possibly for osmoregulatory functions;
The project site is not located within a riverine area, and thus will not affect aggregation
behavior or fish movement.
(4) A flow regime (i.e., the magnitude, frequency, duration, seasonality, and rate-ofchange of fresh water discharge over time) necessary for normal behavior, growth, and
survival of all life stages in the riverine environment, including migration, breeding site
19
selection, courtship, egg fertilization, resting, and staging, and for maintaining spawning
sites in suitable condition for egg attachment, egg sheltering, resting, and larval staging;
The proposed project will not alter flow patterns and this is not expected to negatively
affect behavior, growth or reproductive activity.
(5) Water quality, including temperature, salinity, pH, hardness, turbidity, oxygen
content, and other chemical characteristics, necessary for normal behavior, growth, and
viability of all life stages;
The project is not expected to adversely impact water quality. For a short duration after
initial reef deployment there will be some re-suspension of the in-situ sediments, and are
expected to settle out naturally. Turbidity reduction devices would not be effective and
cannot be utilized under this circumstance. The proposed activity will not affect water
quality and thus not affect sturgeon activities that depend on the maintenance of a certain
quality of water.
(6) Sediment quality, including texture and other chemical characteristics, necessary for
normal behavior, growth, and viability of all life stages; and
The proposed activity will not alter sediment composition and thus it is expected that the
project will not alter normal behavior, growth, and viability of all life stages of sturgeon.
(7) Safe and unobstructed migratory pathways necessary for passage within and between
riverine, estuarine, and marine habitats (e.g., an unobstructed river or a dammed river that
still allows for passage).
The proposed activity will not hinder sturgeon migration patterns. The proposed activity
will not affect migration behavior of the gulf sturgeon.
Since Gulf sturgeon may occur in the project area, the applicant will comply with the
“Sea Turtle and Smalltooth Sawfish Construction Conditions” which also applies to
sturgeon, provided in Attachment C.
The project is not anticipated to affect Gulf sturgeon foraging areas or critical habitat
therefore the deployment of artificial reefs within the project area will not likely have an
adverse affect on the Gulf sturgeon.
5.7
West Indian Manatee
5.7.1
Status and Threats
The West Indian manatee, also known as the Florida manatee, is a federally listed
endangered aquatic mammal protected under the Endangered Species Act. The Florida
manatee population is divided into four subpopulations; the Upper St. Johns River (4% of
the population); Atlantic Coast (46%); Southwest Florida (38%); and Northwest Florida
(12%) (USFWS 2007). Based on published data for the survival rates, reproduction and
population growth, the Upper St. Johns River and Northwest Florida subpopulations are
expanding and doing well. The Atlantic Coast subpopulation is likely stable and little
information exists on the status of the Southwest Florida subpopulation (USFWS 2007).
20
Based on the 2001 statewide aerial synoptic survey, it is believed that the minimum
population is 3,276 individuals. The manatee population appears to have increased over
the past few decades. In the last decade, annual mortality in Florida has averaged nearly
150 animals a year. In 2006, there were 417 manatee deaths in Florida state waters. In
2005, there were 396 manatee deaths (FWCC 2007). These statistics may reflect an
increase in population growth, increased mortality or better detection of carcasses.
However, the best available sciences indicates that Florida’s manatee population is stable
or growing in all regions of the state except the Southwest, which may contain more than
a third of the statewide population. Red tide continues to threaten manatees on
Southwest Florida, with 37-96 deaths annually in four of the past five years. Preliminary
findings suggest red tide may have been responsible for the deaths of 61 manatees in
2006.
A large percent of mortality is due to collisions with watercrafts, particularly mortality of
calves. The increasing human population growth and visitation in Florida has contributed
to a steady increase in the number of watercraft using Florida’s waters. In 2001, 943,611
vessels were registered in the State of Florida, a 42% increase since 1993. The Florida
Department of Community Affairs estimated that between 300,000 and 400,000 boats
registered in other states us Florida waters each year. With the projected increase in
Florida’s population, coupled with an increase in watercraft usage on Florida’s waters,
interactions between boats and manatees are expected to significantly increase into the
foreseeable future. Another factor in their decline has been the loss of suitable habitat
through incompatible coastal, particularly destruction of seagrass beds.
Manatees have few natural predators, and the greatest natural threats are exposure to cold
temperatures, hurricanes and poisoning from ref tide (USFWS 2007).
5.7.2
During the cooler months between October and April, Florida manatees concentrate in
areas of warmer water. Manatees are thermally stressed at water temperatures below
18ºC (64.4ºF), therefore, during winter months, when ambient water temperatures
approach 20ºC (68ºF), the manatee population confines itself to the coastal waters of the
southern half of peninsular Florida and to springs and warm water industrial outfalls as
far north as southeast Georgia. Manatees also winter in the St. Johns River near Blue
Spring State Park. Severe cold fronts have been known to kill manatees when the
animals did not have access to warm water refuges. During summer months, they may
migrate as far north as coastal Virginia on the east coast and the Louisiana coast on the
Gulf of Mexico and appear to choose areas based on an adequate food supply, water
depth and proximity to freshwater. Annual migratory circuits of some individuals
through the intracoastal waterway of the Atlantic Coast are 1,700 km round trips at
seasonal travel rates as high as 50km/day.
5.7.3
Habitat
Manatees inhabit both salt and fresh water and can be found in shallow (5ft. to usually
<20ft.), slow moving rivers, estuaries, saltwater bays, canals and coastal areas throughout
their range. Manatees have been occasionally observed as far as 3.7 miles off the Florida
21
Gulf coast. The West Indian manatee is herbivorous and feeds upon aquatic plants such
as hydrilla, eelgrass and water lettuce.
5.7.4
Since the Florida manatee may occur in the project area, the applicant will comply with
the “Vessel Strike Avoidance Measures and Injured or Dead Protected Species
Reporting” guidance for marine turtles and marine mammals and provided in Attachment
C.
The project is not anticipated to affect Florida manatee foraging areas or critical habitat
therefore the deployment of artificial reefs within the deployment sites will not likely
have an adverse affect on the Florida manatee.
6.0
Status of Not Listed Species and Habitat
6.1
Bottlenose Dolphin
The northern Gulf of Mexico coastal bottlenose dolphin (Tursiops truncatus) stock has
been defined for management purpose as the bottlenose dolphins occupying the area
which extends from approximately 84ºW longitude to the Mississippi River Delta.
Coastal waters are defined as those from shore, barrier islands, or presumed bay
boundaries to 20 m isobath. As a working hypothesis, it is assumed that dolphins
occupying habitats with dissimilar climactic, coastal and oceanographic characteristics
might be restricted in their movements between habitats. Bottlenose dolphin abundance
for the northern Gulf of Mexico was estimated to be 4,191 dolphins in an assessment
preformed in 1993.
The level of direct human caused mortality is unknown. There are a number of
difficulties associated with the interpretation of stranding data. Stranding data probably
underestimate the extent of fishery related mortality and serious injury because not all of
the dolphins which die or are seriously injured wash ashore, nor will all of those that do
wash ashore necessarily show signs of entanglement or other fishery interaction.
The status of this stock relative to optimum sustainable population is not known and
population trends cannot be determined as a result of insufficient data. This species is not
listed as threatened or endangered under the Endangered Species Act, but is protected
under the Marine Mammal Protection Act.
6.1.1
Since the Bottlenose dolphin may occur in the project area, the applicant will comply
with the “Vessel Strike Avoidance Measures and Injured or Dead Protected Species
Reporting” guidance for marine turtles and marine mammals provided in Attachment B.
The project is not anticipated to affect Bottlenose dolphin foraging areas or habitat
therefore the deployment of artificial reefs within the project area will not likely have an
adverse affect on the Bottlenose dolphin.
22
6.2
Alligator Gar
The range of the alligator gar (Atractosteus spatula) extends from the Florida Panhandle,
through the Gulf Coastal Plain and the Mississippi River Basin extending north to the
lower portions of the Ohio and the Missouri River, and ranges southwest through Texas
down to Veracruz, Mexico. There is a population in the Mississippi Sound and the
brackish waster of the Gulf Coast and Mobile-Tensaw Delta.
The alligator gar is disappearing from many parts of the range and declining population
everywhere due to over fishing and the construction of dikes, dams, and other flood
control devices, resulting in the loss of key breeding.
The gar inhabits large, slow moving rivers, reservoirs, oxbow lakes, bayous and bays, in
fresh and brackish water. The alligator gar is the most tolerant gar species of high
salinity and occasionally strays into salt water. Young gars may be seen at the surface in
debris such as leaves and twigs. They prefer large rivers that have a large overflow
floodplain, but these rivers have all but disappeared in North America sue to the use of
dredging, dams, dikes, and levees.
6.2.1
Presence in Project Area
Since the Alligator gar may occur in the project area, the applicant will comply with the
“Vessel Strike Avoidance Measures and Injured or Dead Protected Species Reporting”
guidance for marine turtles and marine mammals and “Sea Turtle and Smalltooth Sawfish
Construction Conditions”, provided in Attachment C and D.
The project is not anticipated to affect Alligator gar foraging areas or habitat therefore the
deployment of artificial reefs within the project area will not likely have an adverse affect
on the Alligator gar.
7.0
Conclusions
Based on the previously mentioned findings, it has been determined that the proposed project
may affect, but is not likely to adversely affect the following species;
• Loggerhead sea turtle
• Green sea turtle
• Kemp’s ridley sea turtle
• Leatherback sea turtle
• Hawksbill sea turtle
• Gulf sturgeon
• West Indian manatee
• Bottlenose dolphin
• Alligator gar
There is no designated critical habitat for the Florida manatee; therefore there will be no adverse
modifications to critical habitat for this species as a result of the proposed action.
The reef site is located within Unit 11 critical habitat area for the Gulf Sturgeon. This assessment
contains a discussion of the project relative to the seven elements considered essential for the
conservation of the species. The project is not anticipated to affect Gulf sturgeon foraging areas
23
or critical habitat therefore the deployment of artificial reefs within the project area will not likely
have an adverse affect on the Gulf sturgeon.
The project is not expected to adversely impact water quality. For a short duration after initial
reef deployment there will be some re-suspension of the in-situ sediments, and are expected to
settle out naturally. Turbidity reduction devices would not be effective and cannot be utilized
under this circumstance.
8.0
References
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Bjorndal (ed). Biology and Conservation of Sea Turtles. Smithsonian Institution Press,
Washington, D.C. 117-1125.
Bjorndal, K.A. (ed). 1981. Biology and Conservation of Sea Turtles. Proceedings of the World
Conference on Sea Turtle Conservation, Washington, D.C., 26-30 November 1976.
Smithsonian Institution Press, Washington, D.C.
Bowen, B. W. 1995. Tracking marine turtles with genetic markers. BioScience 45: 528-34.
Bowen, B., J. Avise, J.I. Richardson, A. Meylan, D. Margaritoulis, and S. Hopkins-Murphy.
1993. Population structure of loggerhead turtles (Caretta caretta) in the northwestern
Atlantic Ocean and Mediterranean Sea. Conservation Biology 7: 834-44.
Bowen, B.W., N. Kamezaki, D.J. Limpus, G.R. Hughes, A.B. Meylan and J.C. Avise. 1994.
Global phylogeography of the loggerhead turtle (Caretta caretta) as indicated by
mitochondrial DNA haplotypes. Evolution 48: 1820-28.
Campbell, L. 1995. Endangered and threatened animals of Texas, their life history and
management. Texas Parks and Wildlife Department, Resource Protection Division,
Endangered Resources Branch, Austin.
Carr, A.F. 1952. Handbook of turtles: the turtles of the United States, Canada and Baja
California. Comstock Publ. Assoc., Cornell University Press, Ithaca, NY.
Carr, A. and H. Hirth. 1962. The ecology and migrations of sea turtles, 5. Comparative features of
isolated green turtle colonies. No. 2091. 42pp.
Eckert, S.A. 1992. Bound for deepwater. Natural History, March 1992, pp. 28-35.
Encalada, S.E., K.A. Bjorndal, A.B. Bolten, J.C. Zurita, B. Schroeser, E. Possardt, C.J. Sears, and
B.W. Bowen. 1998. Population structure of loggerhead turtle (Caretta caretta) nesting
colonies in the Atlantic and Mediterranean as inferred from mitochondrial DNA control
region sequences. Marine Biology 130: 567-75.
Florida Fish and Wildlife Conservation Commission. 2007. Manatee Mortality Report and
Statistics. http://research.myfwc.com/manatees/.
Frazer, N.B. and L.M. Ehrhart. 1985. Preliminary growth models for green, Chelonia mydas, and
loggerhead, Caretta caretta, turtles in the wild. Copeia 1985: 73-79.
24
Frazer, N.B., C.J. Limpus and J.L. Greene. 1994. Growth and age at maturity of Queensland
loggerheads. U.S. Dep. Of Commerce. NOAA Tech. Memo NMFS-SEFSC-351: 42-45.
Fritts, T.H., R.P. Reynolds and M.A. McGehee. 1983. The distribution and abundance of marine
turtles in the Gulf of Mexico and nearby Atlantic waters. Journal of Herpetology 17: 32744.
Hirth H.F. 1971. Synopsis of biological data on the green turtle, Chelonia mydas. FAO Fisheries
Synopsis No. 85: 1-77.
Hirth H.F. 1997. Synopsis of biological data on the green turtle, Chelonia mydas (Linnaeus
1758). Biological Report 97 (1). U.S. Fish and Wildlife Service, Washington, D.C.
Keevin, Thomas M. and Gregory L. Hempton. 1997. The Environmental Effects of Underwater
Explosions with Methods to Mitigate Impacts, U.S. Army Corps of Engineers, St. Louis
District, St. Louis, Missouri.
Meylan, A. 1982. sea turtle migration-evidence from tag returns. In: K.A. Bjorndal (ed). Biology
and conservation of sea turtles. Smithsonian Institution Press, Washington, D.C. 91-100.
Milton, S.L., S. Leone-Kabler, A.A. Schulman and P.L. Lutz. 1994. Effects of Hurricane Andrew
on the sea turtle nesting beaches of South Florida. Bulletin of Marine Science 54: 974981.
Mortimer, J.A. 1982. Feeding ecology of sea turtles. In: K.A. Bjorndal (ed). Biology and
conservation of sea turtles. Smithsonian Institution Press, Washington, D.C. 103-09.
Mrosovsky, N. 1995. Temperature and sex ratio. In: K.A. Bjorndal (ed). Biology and
conservation of sea turtles, revised edition. Smithsonian Institution Press, Washington,
D.C. 597-98.
Musick, J. 1979. The marine turtles of Virginia with notes on identification and natural history.
Educational Series No. 24. Sea Grant Program, Virginia Institute of Marine Sciences,
Gloucester Point.
Musick, J.A. and C.J. Limpus. 1997. Habitat utilization and migration in juvenile sea turtles. In:
Lutz P.L. and J.A. Musick (eds). The Biology of Sea Turtles. CRC Press, New York.
137-164.
National Fish and Wildlife Laboratory (NFWL). 1980. Selected vertebrate endangered species of
the seacoast of the United States. U.S. Fish and Wildlife Service, Biological Services
Program, Washington, D.C. FWS/OBS-80/01.
National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration.
2007a Information on sea turtles. http://www/nmfs.noaa/gov/pr/species/turtles/html.
2007b. Information on the Gulf sturgeon.
http://www/nmfs.noaa/gov/pr/species/fish/Gulf_sturgeon.html.
25
1991a. Recovery plan for U.S. population of loggerhead turtle. National Marine Fisheries
Service, Washington, D.C.
1991b. Recovery plan for U.S. population of Atlantic green turtle. National Marine Fisheries
Service, Washington, D.C.
2005. Bottlenose dolphin Northern Gulf of Mexico Coastal Stocks.
http://www/nmfs.noaa/gov/pr/pdf/sars/ao2005dobn-gmexco.pdf.
Olsen Associates Inc. 2002. Pensacola Beach, FL, Beach Restoration Project Biological
Assessment. Submitted to the U.S. Army Corps of Engineers, Jacksonville District.
March 20, 2002.
Pearce, A.F. 2001. Contrasting population structure of the loggerhead turtle (Caretta caretta)
using mitochondrial and nuclear DNA markers. M.S. thesis. University of Florida,
Gainesville, FL .
Pritchard, P.C.H., and R. Marquez. 1973. Kemp’s ridley turtle or Atlantic ridley, Lepidochelys
kempi. IUCN Monograph 2, Morges, Switzerland.
Pritchard, P.C.H. 1977. Marine turtles of Micronesia. Chelonia Press, San Francisco, CA.
Rebel, T.P. 1974. Sea turtles and the turtles industry of the West Indies, Florida, and the Gulf of
Mexico revised edition. University of Miami Press, Coral Gables, FL.
Ross, J.P. 1981. Historical decline of Loggerhead, Ridley and Leatherback sea turtles. In: K.A.
Bjorndal (ed). Biology and conservation of sea turtles. 1981. 189-95.
Schwartz, F. 1976. Status of sea turtles, Cheloniidae and Dermochelidae in North Carolina.
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Academy of Science, Inc., April 2-3, 1976, at the University of North Carolina,
Wilmington, N.C. J. Elisha Mitchell Sci. Soc. 92: 76-77.
Shaver, D. 1991. Feeding ecology of wild and head started Kemp’s ridley sea turtles in south
Texas waters. Journal of Herpetology 25: 327-34.
Tuato o-Bartley, N., T.E. Morrell and P. Craig. 1993. Status of sea turtles in American Samoa in
1991. Pacific Science 47: 215-21.
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National Artificial Reef Plan (As Amended): Guidelines for siting, construction,
development, and assessment of artificial reefs.
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2000. Report on the Mexico/United States of America Population Restoration Plan for the
Kemp’s Ridley Sea Turtle, Lepidochelys kempii, on the Coasts of Tamaulipas and
Veracruz, Mexico.
26
U.S. Fish and Wildlife Service and Gulf States Marine Fisheries Commission [GSMFC]. 1995.
Gulf sturgeon recovery plan. Atlanta, GA.
U.S. Fish and Wildlife Service and National Marine Fisheries Service. 1992. Recovery plan for
the Kemp’s ridley sea turtle (Lepidochelys kempii). National Marine Fisheries Service, St.
Petersburg, FL.
Witzell, W.N. 1983. Synopsis of biological data on the hawksbill turtle Eretmochelys imbricate
(Linnaeus, 1766). FAO Fisheries Synopsis no. 137. FIR/S137, SAST-Hawksbill Turtle5.31 (07) 017.01. Food and Agriculture Organization (FAO) of the United Nations,
Rome, Italy.
27
Attachment A
JOINT APPLICATION AND PERMIT
DRAWINGS DEPICTING THE PROPOSED
REEF DEPLOYMENT SITE
Attachment B
REEF MATERIALS
INTRODUCING ECOSYSTEMS
ARTIFICIAL REEF
EcoSystem Disc
Patent 7513711 & Patent pending
Hole in center for
installation over piling
Rounds discs of concrete
embedded with Limestone Rock
Spaces between discs can be
increased to provide varied habitat
for marine life
PILING MOUNT
Piling Mount prevents moving, settling, turning over during storm
events, or in places where a small footprint is necessary to protect a
natural reef
Mounting on a fiberglass piling prevents movement during storm
events. The fiberglass piling and the concrete EcoSystem discs have
no known life. Concrete was used by the Romans 2,000 years ago
and is still intact. Fiberglass has no know life as well. The test units
above were installed in the surf, Gulf Shores, AL. Survived 4 storm
events so far.
Two disc EcoSystem unit installed
next to new fishing pier in Gulf
Shores, AL . This unit survived four
storm events in the Gulf of Mexico
with no damage and is working well
today.
EcoSystems provides estuary habitat, using natural Florida
Limestone rock. This provides the perfect PH substrate for
marine animals to populate
Elevating the reef structure above the bottom
prevents silting or sand encroachment thereby
utilizing the entire reef unit for the growth of
marine life.
Oysters growing on EcoSystems unit
within one year
This EcoSystem unit is located in Orange Beach, AL, ½
mile inland from Perdido Pass. The Oysters growing here
seemed prefer a specific narrow level in the water
column, so elevating the substrate provided the only
place in that area where Oysters grow.
Contact us for more information reefmaker@gulftel.com
or 251-979-2200
Attachment C
VESSEL STRIKE AVOIDANCE
MEASURES AND INJURED OR DEAD
PROTECTED SPECIES REPORTING
Vessel Strike Avoidance Measures
and Reporting for Mariners
NOAA Fisheries Service, Southeast Region
Background
The National Marine Fisheries Service (NMFS) has determined that collisions with vessels can
injure or kill protected species (e.g., endangered and threatened species, and marine mammals).
The following standard measures should be implemented to reduce the risk associated with
vessel strikes or disturbance of these protected species to discountable levels. NMFS should be
contacted to identify any additional conservation and recovery issues of concern, and to assist in
the development of measures that may be necessary.
Protected Species Identification Training
Vessel crews should use an Atlantic and Gulf of Mexico reference guide that helps identify
protected species that might be encountered in U.S. waters of the Atlantic Ocean, including the
Caribbean Sea, and Gulf of Mexico. Additional training should be provided regarding
information and resources available regarding federal laws and regulations for protected species,
ship strike information, critical habitat, migratory routes and seasonal abundance, and recent
sightings of protected species.
Vessel Strike Avoidance
In order to avoid causing injury or death to marine mammals and sea turtles the following
measures should be taken when consistent with safe navigation:
1. Vessel operators and crews should maintain a vigilant watch for marine mammals and
sea turtles to avoid striking sighted protected species.
2. When whales are sighted, maintain a distance of 100 yards or greater between the whale
and the vessel.
3. When sea turtles or small cetaceans are sighted, attempt to maintain a distance of 50
yards or greater between the animal and the vessel whenever possible.
4. When small cetaceans are sighted while a vessel is underway (e.g., bow-riding), attempt
to remain parallel to the animal’s course. Avoid excessive speed or abrupt changes in
direction until the cetacean has left the area.
5. Reduce vessel speed to 10 knots or less when mother/calf pairs, groups, or large
assemblages of cetaceans are observed near an underway vessel, when safety permits. A
single cetacean at the surface may indicate the presence of submerged animals in the
vicinity; therefore, prudent precautionary measures should always be exercised. The
vessel should attempt to route around the animals, maintaining a minimum distance of
100 yards whenever possible.
NMFS Southeast Region Vessel Strike Avoidance Measures and Reporting for Mariners; revised February 2008.
6. Whales may surface in unpredictable locations or approach slowly moving vessels.
When an animal is sighted in the vessel’s path or in close proximity to a moving vessel
and when safety permits, reduce speed and shift the engine to neutral. Do not engage the
engines until the animals are clear of the area.
Additional Requirements for the North Atlantic Right Whale
1. If a sighted whale is believed to be a North Atlantic right whale, federal regulation
requires a minimum distance of 500 yards be maintained from the animal (50 CFR
224.103 (c)).
2. Vessels entering North Atlantic right whale critical habitat are required to report into the
Mandatory Ship Reporting System.
3. Mariners should check with various communication media for general information
regarding avoiding ship strikes and specific information regarding North Atlantic right
whale sighting locations. These include NOAA weather radio, U.S. Coast Guard
NAVTEX broadcasts, and Notices to Mariners. Commercial mariners calling on United
States ports should view the most recent version of the NOAA/USCG produced training
CD entitled “A Prudent Mariner’s Guide to Right Whale Protection” (contact the NMFS
Southeast Region, Protected Resources Division for more information regarding the CD).
4. Injured, dead, or entangled right whales should be immediately reported to the U.S. Coast
Guard via VHF Channel 16.
Injured or Dead Protected Species Reporting
Vessel crews should report sightings of any injured or dead protected species immediately,
regardless of whether the injury or death is caused by your vessel.
Report marine mammals to the Southeast U.S. Stranding Hotline: 877-433-8299
Report sea turtles to the NMFS Southeast Regional Office: 727-824-5312
If the injury or death of a marine mammal was caused by a collision with your vessel,
responsible parties should remain available to assist the respective salvage and stranding network
as needed. NMFS’ Southeast Regional Office should be immediately notified of the strike by
email (takereport.nmfsser@noaa.gov) using the attached vessel strike reporting form.
For additional information, please contact the Protected Resources Division at:
NOAA Fisheries Service
Southeast Regional Office
th
263 13 Avenue South
St. Petersburg, FL 33701
Tel: (727) 824-5312
Visit us on the web at http://sero.nmfs.noaa.gov
NMFS Southeast Region Vessel Strike Avoidance Measures and Reporting for Mariners; revised February 2008.
Attachment D
SEA TURTLE AND SMALLTOOTH
SAWFISH CONSTRUCTION CONDITIONS

Biological Assessment – Gulf Side Reef

Transcription

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